ii8 



MENDELISM 



at all . . . but the onely way to have double flowers 

 any yeare is to save the seedes of those plants of 

 this kindc that beare single flowers, for from that 

 seede will rise, some that will beare single, and some 

 double flowers." With regard to the nature of these 

 double- throwing strains of singles. Miss Saunders 

 has recently brought out some interesting facts. She 



Fig. 27. 

 Single and double stocks raised from the same single parent. 



crossed the double - throwing singles with pure 

 singles belonging to strains in which doubles never 

 occur. The cross was made both ways, and in 

 both cases all the F^ plants were single. A distinc- 

 tion, however, apj^eared when a further generation 

 was raised from the Fj plants. All the F plants 

 from the pollen of the double throwing single behaved 

 like double throwing singles, but of the F^ plants 



